Hmm, i happen to own the hat just now, sooo... Imma steal this one! Also technically a counter, but the other suggestion is a meme.

ALL credits to done and Foamy.

Proof by done:

Sold in a day for 122 Keys (18 used on max, 27 on brain warming):

https://backpack.tf/profiles/76561198839802490#!/compare/1529798400/1529884800

Sold for GE Norsemann (84) + Duped Eerie Dapper's (40) + Stormy Brainiac (~23*) + Smoking Pencil (~15*) + HG Sky High (14*) + 35 Keys on a B/O of 195:

http://www.tf2outpost.com/trade/29656768

https://backpack.tf/profiles/76561198072738316#!/compare/1527638400/1527984000 ~195

Norsemann sold for GGJR Ground Control (80) + 4 Keys:

https://backpack.tf/profiles/76561198112516663#!/compare/1528070400/1528156800 ~84

Ground Control sold for Burning Head Hedge (100) for a buyout lower than 80:

https://backpack.tf/profiles/76561198105071091#!/compare/1527811200/1528070400 ~80

Was 80 for a while, then dropped before selling:

http://www.tf2outpost.com/trade/29630830

Dapper sold for FoD Most Wanted (6) + 34 Keys:

https://backpack.tf/profiles/76561198058301976#!/compare/1528416000/1528502400 ~40

Sold for 125 Keys twice (one took 3 days, one took a week):

https://backpack.tf/profiles/76561198010059325#!/compare/1526515200/1526601600

Sold for Burning Tyrant's on a B/O of 180:

http://www.tf2outpost.com/user/76561198186712911

https://backpack.tf/profiles/76561198186712911#!/compare/1528156800/1528329600 ~180

Sold for Duped PE Hallmark + Scorching Bolted Bicorne (~45*) + Aus Sticky (12) + S Pro Grenade (7) + Grail Oblooterated (7):

https://backpack.tf/profiles/76561198132226518#!/compare/1526601600/1526688000 ~ No mini on hallmark, probably close to low end

Sold for Moon Lucky (95) + FoD Shred (10) + Burly beast (6) + 62 Keys:

https://backpack.tf/profiles/76561198114402400#!/compare/1527984000/1528070400 ~173 keys

Foamys comment:

New sales:

120 keys

https://backpack.tf/profiles/76561198020167834#!/compare/1532908800/1532995200

130 keys

https://backpack.tf/profiles/76561198090123523#!/compare/1533340800/1533859200

Keys but idk how many; looking at the total return value probably close to buy orders

https://backpack.tf/profiles/76561198001786794#!/compare/1532563200/1532649600

Same story here except I really have no clue how much it was

https://backpack.tf/profiles/76561198246867744#!/compare/1532390400/1532476800

https://backpack.tf/profiles/76561197961643548#!/compare/1532217600/1532476800

https://backpack.tf/suggestion/5b37831944325a38093b9b90 that norse isnt stable at all and should not be used here.

All in all that brings the sale density far more to your lower regions than the higher end here; sales are now at:

105

120

122

125

125

130

~135 by estimates

173

173

180 (actually 203 but capped)

I'm okay dismissing 105 as qs here. The actual common trading point here should be 120-130, but with 2 sales at 173 and the tyrants kinda backing up that part of your range (as well as the fact that some of the lower sales went relatively fast), I'd make this 120-175 (or 120-180 if you REALLY want to - I'd render it an outlier here since the actual sale deviates much more from the common trading point, and the only thing bringing it relatively close is that buyout; my vote'd be 120-175)

Id go with 120-180 for more clout a prettier range, but fuck that. 120-175.